The wp_list_users_args filter hook in WordPress allows developers to modify the arguments passed to the wp_list_authors() function, which is used to display a list of users on the site.

Here’s an example of how to use the wp_list_users_args filter hook to modify the user list output:

function custom_user_list_args( $args ) {
  $args['exclude'] = array( 1, 2, 3 ); // exclude users with ID 1, 2, and 3 from the list
  return $args;
}
add_filter( 'wp_list_users_args', 'custom_user_list_args' );

In this example, we’ve defined a custom function custom_user_list_args() that accepts the default $args array passed to the wp_list_users() function. We then modify the $args array to exclude users with ID 1, 2, and 3 from the list by setting the exclude argument to an array of user IDs.

Finally, we add the custom_user_list_args() function as a filter to the wp_list_users_args hook using the add_filter() function.

This example demonstrates how the wp_list_users_args filter hook can be used to modify the arguments passed to wp_list_users() function and customize the user list output.